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Lithium aluminium hydride

Lithium aluminium hydride, commonly abbreviated to LAH, is an inorganic compound with the chemical formula LiAlH4. It was discovered by Finholt, Bond and Schlesinger in 1947. This compound is used as a reducing agent in organic synthesis, especially for the reduction of esters, carboxylic acids, and amides. The solid is dangerously reactive toward water, releasing gaseous hydrogen (H2). Some related derivatives have been discussed for hydrogen storage.

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Further Information

Names

Preferred IUPAC name: Lithium tetrahydridoaluminate(III)

Systematic IUPAC nameLithium alumanuide

Other names

Lithium aluminium hydride

Lithium tetrahydridoaluminate(III)

Identifiers

CAS Number: 16853-85-3

JSmol: Interactive image

Abbreviations: LAH

ChEBI: CHEBI:30142

ChemSpider: 26150

ECHA InfoCard: 100.037.146

EC Number: 240-877-9

Gmelin Reference: 13167

PubChem: 28112

RTECS number: BD0100000

Properties

Chemical formula: LiAlH

Molar mass: 37.95 g/mol

Appearance: hygroscopic

Odor: odorless

Density: 0.917 g/cm, solid

Melting point: 150 °C (302 °F; 423 K) (decomposes)

Solubility in water: Reacts

Solubility: 112.332 g L

Solubility: 39.5 g/100 mL

Structure

Crystal structure: monoclinic

Space group: P

Thermochemistry

Specific
heat capacity: 86.4 J/mol K

Std molar
entropy: 87.9 J/mol K

Std enthalpy of
formation: -117 kJ/mol

Gibbs free energy: -48.4 kJ/mol

Hazards

Safety data sheet: External MSDS

GHS pictograms:

GHS signal word: DANGER

GHS hazard statements: H260

NFPA 704:

Flash point: 125 °C (257 °F; 398 K)

Related compounds

hydride: aluminium hydride

Except where otherwise noted, data are given for materials in their(at 25 °C [77 °F], 100 kPa).Except where otherwise noted, data are given for materials in their(at 25 °C [77 °F], 100 kPa).